package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;


    /**
     * 根据分类id查询菜品
     *
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.selectByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


    /**
     * 新增菜品以及对应的风味
     *
     * @param dishDTO
     */
    @Transactional
    @Override
    public void insertWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //向菜品表插入数据
        dishMapper.insert(dish);


        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        //得到传过来的风味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            //遍历flavors并为flavors中的每一个dish_id赋值
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insert(flavors);
        }
    }

    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult dishPageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());

        Page<DishVO> page = dishMapper.dishPageQuery(dishPageQueryDTO);
        long total = page.getTotal();
        List<DishVO> result = page.getResult();
        return new PageResult(total, result);
    }

    /**
     * 根据id批量删除菜品
     *
     * @param ids
     */
    @Override
    @Transactional   //涉及到多个表的操作
    public void delete(List<Long> ids) {
        //是否存在起售中的菜品
        for (Long id : ids) {
            Dish dish = dishMapper.selectById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //当前菜品处于起售状态  不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //是否被套餐关联
        List<Long> setmealIds = setmealDishMapper.selectSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            //当前菜品关联了套餐，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH);
        }

        //删除菜品表中的菜品

        dishMapper.delete(ids);
        //删除次菜品关联的口味数据
        dishFlavorMapper.deleteByDishId(ids);

    }


    /**
     * 菜品的起售、停售
     *
     * @param status
     * @param id
     */
    @Override
    public void startOrstop(Integer status, Long id) {
        Dish dish = Dish.builder().id(id).status(status).build();
        dishMapper.update(dish);
    }


    /**
     * 根据id查询菜品
     *
     * @param id
     * @return
     */
    @Override
    public DishVO select(Long id) {
        Dish dish = dishMapper.selectById(id);
        List<DishFlavor> dishFlavors = dishFlavorMapper.selectByDishId(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }


    /**
     * 修改菜品
     *
     * @param dishDTO
     */
    @Override
    public void update(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //修改菜品   不动风味
        dishMapper.update(dish);
        //删除原来的风味
        Long dishId = dishDTO.getId();
        dishFlavorMapper.delete(dishId);
        //添加新的口味


        //得到传过来的风味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            //遍历flavors并为flavors中的每一个dish_id赋值
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insert(flavors);
        }
    }
}
